Malicious PDF — malware analysis report

Static analysis result for SHA-256 952c762719ed2aa7…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 12:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 73d4a88ad1b01a8e5c54dc625bc3880d SHA-1: 9cc4d9c9166ff614b40b3e12ffc8aa58dc9ac48b SHA-256: 952c762719ed2aa7f4519b279cb8d64f4d466e604ada82b049b2391dd4367cb9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/videos-de-como-ser-hacker-en-roblox-2021-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-dumb-brothers-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-to-roblox-card_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E2 27716 bytes
SHA-256: 91e2ae2513d82368ca57a418525a87131fbec7d7e22bf3845e88fb83137c5196
font_01_sfnt_off00009234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9234 19440 bytes
SHA-256: bc3641820347c85f53d5649ebd3c818015c930aaf48f77572a8689628ce37a41

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